Pneumatic tire.



PATENTED JAN. 17, 1905.

W. WLWALER. PNEUMATIG TIRE.

APPLIUATION FILED AUG. 17. 1904. l

UNITED STATES Patented January 17', 1905..

PATENT OEEICE.

WILLIAM W. WALTER, OF AURORA, ILLINOIS, ASSIGNOR OF JAY D. MILLER, OF GENEVA, ILLINOIS.

ONE-HALF TO PNUMATIG TlRE.

SPECIFICATION forming part of Letters Patent No. 780,462, dated January 17, 1905.

' Application IiledAugu'st 17,1904- Serial No. 220,994.

lo /LZZ whom it may concern:

Be it known that I, WILLIAM W. WALTER, a citizen of the United States, residing at Aurora, in the county ofl Kane and State of Illinois, have invented certain new and useful Improvements in Pneumatic Tires, of Vwhich the following is a specification.

This invention relates to pneumatic tires mainly intended for heavy vehicles, as automobiles, although suitable also for bicycles.

The objects of the invention are to prevent puncture of the iniatable tube of the tire by cutting or piercing articles encountered on roadways-such as glass, nails, or tacksand also lto provide an inexpensive, non-elastic, and strong support for the inner surface of the outer tube. I attain these objects by the construction illustrated in the accompanying drawings, in whichu Figure l is a side view, partly in section, of a portion of a tire constructed in accordance with my invention. Fig. 2 is a transverse vertical sectionbf the same. Fig. 3 is a transverse vertical section of a slightly-modified form of the tire. i

In said drawings, Arepresents the outer rubber-coated tube inclosing all the parts of the tire, which is placed within the rim B of the metal wheel. Within the outer tubeA is placed the iniatable tube C in the portion inclosed by the rim B. Between the outer portion of the inflatable vtube O and the inner surface ofv the tube A is placed a series of small slabs D, having substantially parallel sides,

as boards; but their periphery is of substantially crescent form, with rounded ends to prevent them from injuring theinner tube or the outer tube. Their convex edge Vcorresponds in form with the inner surface of the tube A, while the concave edge corresponds in form with the outer surface of the iniatable tube C.

As the tubes A and O are substantially cylindrical, but differ greatly in diameter, there is placed within the tube A a cushion E, made of substantially hard rubber', which has its outer surface made with a curvature corresponding with the curvature of the inner surface of the tube A`; but the inner surface of bers, and consequently allow its top to yield to some extent under the pressure of the inner edges ofthe boards D, and thereby increase the resilience of the tubes A and O.

The cresent-shaped boards D are made of close-grain, unyielding, and non-elastic Wood, basswood being preferred, which materially differ from 'cork-bark, which has been used as a filling in tires.

To conveniently obtain the cresent-shaped boards D, ,a long piece of timber is first taken and shaped so that a cross-section thereof will have a cresent shape with rounded ends, as shown in Eig.` 2, and then the piece of timber is cut transversely with a saw into sections about an inch wide, more or less. Asa portion of the inner periphery of the tube A is generally left open while building the tire,

before the inner tube O is inflated, as they are fruoe of attachment to the innerer to the outer tu e.

In the modification shown in Fig. 3 there is also an outer tube, (shown at A2,) an inflated air-tube O2, a series of cresent-shaped vboards D2, and air-chambers F2 on the sides of the air-tube O2; but the inner surface of the tube A2 serves as a cushion or support for the tube C2, as the curvature of the latter corresponds with that of the tube A2 and may be used for light vehicles, as bicycles and other vehicles.

Havingnow fully described my invention, I claiml. In a pneumatic tire, the combination of an outer tube, an inner flexible tube, a series of non-elastic crescent-shaped boards with rounded ends, of unyielding timber free of attachment to the outer or to the inner tube, having their convex edge simply bearing against the interior of the outer tube and their inner concave edge bearing upon the inner tube, airchambers occupying positions intermediate of the outer tube, the inner tube and the rounded ends of the edges ofthe boards, with a cushion E thinner in the middle portion and located between a portion of the inner tube and of the outer tube, substantially as described.

2. In a pneumatic tire, the combination of an outer tube, an inner exible tube, a series of non-elastic crescent-shaped boards having rounded ends, oi' unyielding timber free of attachment to the outer or to the inner tube,hav

v ing their convex edge simply bearing against 

